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Method for preparing salt-resistant stain-resistant bentonite with adsorption function

A technology of bentonite and sodium-based bentonite, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as expansion index and viscosity reduction, anti-seepage performance decline, and failure to form connections, etc., to achieve good expansion performance, Strong anti-salt and anti-fouling ability, simple method

Active Publication Date: 2014-09-10
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The blue absorption, swelling performance and cohesiveness of bentonite after sodium modification will also be greatly improved, but in salt (sea) water and sewage, the water molecules in the middle layer and interlayer of the bentonite molecular structure first interact with salt (sea) water Or the debris containing a large amount of electrolytes in the sewage reacts, causing its molecular structure to be destroyed or the connection between the molecular structures cannot be formed, resulting in a greatly reduced expansion index and viscosity, and a significant decrease in anti-seepage performance.
Therefore, only the bentonite modified by sodium has poor adaptability to salt (sea) water and sewage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation of salt-resistant and pollution-resistant bentonite comprises the following steps:

[0023] (1) Sodiumization: Grind the natural calcium-based bentonite and pass it through a 100-mesh sieve, add a sodium bicarbonate aqueous solution with a concentration of 10% by mass, stir at 70° C. for 2 hours, and dry to obtain sodium-based bentonite; , the mass ratio of sodium bicarbonate and natural calcium-based bentonite is 30:100.

[0024] (2) Modification: the sodium bentonite obtained in step (1) is ground and passed through a 200-mesh sieve, dried and mixed with modifier sodium pyrophosphate at room temperature, the quality of modifier sodium pyrophosphate and sodium bentonite The ratio is 5:100, that is.

Embodiment 2

[0026] The preparation of salt-resistant and pollution-resistant bentonite comprises the following steps:

[0027] (1) Sodiumization: Grind the natural calcium-based bentonite and pass it through a 50-mesh sieve, add a sodium hydroxide aqueous solution with a concentration of 5% by mass, stir at 50° C. for 4 hours, and dry to obtain sodium-based bentonite; , the mass ratio of sodium bicarbonate and natural calcium-based bentonite is 25:100.

[0028] (2) Modification: the sodium bentonite prepared in step (1) is ground and passed through a 150 mesh sieve, dried and mixed with modifier polyacrylamide at room temperature, the quality of modifier polyacrylamide and sodium bentonite The ratio is 1:100, that is to say.

Embodiment 3

[0030] The preparation of salt-resistant and pollution-resistant bentonite comprises the following steps:

[0031] (1) Sodiumization: Grind the natural calcium-based bentonite and pass it through a 150-mesh sieve, add a sodium chloride aqueous solution with a concentration of 20% by mass, stir at 90° C. for 1 hour, and dry to obtain sodium-based bentonite; , the mass ratio of sodium bicarbonate and natural calcium-based bentonite is 40:100.

[0032] (2) Modification: the sodium bentonite obtained in step (1) is ground and passed through a 250 mesh sieve, dried and then mixed with modifier sodium carboxymethyl cellulose at room temperature, and the modifier sodium carboxymethyl cellulose The mass ratio of sodium bentonite to sodium bentonite is 2:100.

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PUM

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Abstract

The invention provides a method for preparing salt-resistant stain-resistant bentonite with adsorption function. The method comprises the following steps: performing sodium treatment, namely milling natural calcium bentonite to pass through a sieve with the granularity of 50-150 meshes, adding the bentonite into an aqueous solution of a sodium treatment agent, stirring, performing sodium treatment and reacting at the temperature of 50-90 DEG C for 1-4 hours, and drying to obtain sodium-based bentonite; and modifying, namely milling the sodium-based bentonite to pass through a sieve with the granularity of 150-250 meshes, drying and mixing with a modifier at normal temperature, and obtaining the product. The bentonite prepared by the method is high in expansibility, has high salt resistance, high stain resistance and good adsorption performance, can be used for underground seepage prevention of high salinity complex water bodies and also can be used for treating heavy metal ions and organic pollutants in contaminated water.

Description

technical field [0001] The invention belongs to the technical field of deep processing of bentonite materials, and in particular relates to a preparation method of salt-resistant and pollution-resistant bentonite with adsorption function. Background technique [0002] Bentonite is a clay mineral mainly composed of montmorillonite. It has strong hygroscopicity and can absorb water equivalent to 8 to 20 times its own volume and expand to 30 times. It also has strong cohesiveness, Compactness, self-healing and ion exchange properties, so it is widely used in metallurgy, anti-seepage engineering, water treatment and other fields. However, most bentonites in nature are calcium-based, and their expansibility and adsorption capacity are significantly inferior to those of sodium-based, so the sodium modification of bentonite is an important research in the field of deep processing of bentonite. [0003] The specific surface area and adsorption performance of bentonite after sodium ...

Claims

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Application Information

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IPC IPC(8): C01B33/40
Inventor 祝建中胡志强丁莹韩刚朱志芳
Owner HOHAI UNIV
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